| Castleton to Opwijk | 323.98 mi (521.39 km) |
| Castleton to Ostend | 269.67 mi (434.00 km) |
| Castleton to Oud-Heverlee | 346.42 mi (557.50 km) |
| Castleton to Oud-Turnhout | 339.63 mi (546.59 km) |
| Castleton to Oudenaarde | 309.01 mi (497.30 km) |
| Castleton to Oudenburg | 274.23 mi (441.33 km) |
| Castleton to Oupeye | 386.32 mi (621.72 km) |
| Castleton to Overijse | 343.79 mi (553.27 km) |
| Castleton to Overpelt | 359.30 mi (578.24 km) |
| Castleton to Paal | 356.63 mi (573.95 km) |
| Castleton to Peer | 363.62 mi (585.19 km) |
| Castleton to Pepinster | 398.13 mi (640.72 km) |
| Castleton to Peruwelz | 323.76 mi (521.05 km) |
| Castleton to Perwez | 360.26 mi (579.77 km) |
| Castleton to Philippeville | 369.96 mi (595.40 km) |
